使用Groovy配置中的Spring动态语言支持 [英] Using Spring Dynamic Languages Support from Groovy Configuration

问题描述

我想使用动态语言支持，以从Groovy脚本创建可重载 bean（在运行时 ）。我想避免 xml 配置，并在 Spring Boot 应用程序上下文中使用注释（或类似的）。

这是对问题已经被问到，扩展名是我想用 BeanPostProcessors ， Handlers ， Parsers ，无论如何。



我已经快速浏览了javadoc的 ScriptFactoryPostProcessor ，并提出了工作示例。我想知道为什么 Application.groovy（v2）不起作用？



---

beans.xml - 有效！ （但我想在 Application.groovy 中定义bean，而不是 xml ...）

 < bean class =org.springframework.scripting.support.ScriptFactoryPostProcessor> 
< property name =defaultRefreshCheckDelayvalue =1000/> 
< / bean> 
 
< bean id =foobar0class =org.springframework.scripting.groovy.GroovyScriptFactory> 
< constructor-arg value =file：/ C：/someDir/src/main/static/FoobarService.groovy/> 
< / bean> 
  

---

Application.groovy v1） - 有效！ （但是是一个非常丑陋的解决方法）


$ b

@SpringBootApplication
public class Application {
public static void main（String [] args）{
SpringApplication app = new SpringApplication（Application）
//在编写应用程序之后添加GroovyScriptFactory ...
app.addListeners（new ApplicationListener< ApplicationPreparedEvent>（）{
void onApplicationEvent（ApplicationPreparedEvent event）{
def registry =（BeanDefinitionRegistry）event.applicationContext.autowireCapableBeanFactory
def bd = BeanDefinitionBuilder。 genericBeanDefinition（GroovyScriptFactory）
.addConstructorArgValue（file：/ C：/someDir/src/main/static/FoobarService.groovy）
.getBeanDefinition（）
b.setAttribute（ScriptFactoryPostProcessor.REFRESH_CHECK_DELAY_ATTRIBUTE ，1000）
registry.registerBeanDefinition（'foobar0'，bd）
}
}）
app.run（args）
}
@Bean
ScriptFactoryPostProcessor scriptFactory（） {
新的ScriptFactoryPostProcessor（）
}
}


---

Application.groovy（v2） - 无效 - 为什么不能？

@SpringBootApplication
public class Application {
public static void main（String [] args ）{
SpringApplication.run（Application，args）
}
@Bean
ScriptFactoryPostProcessor scriptFactory（）{
ScriptFactoryPostProcessor（）
}
@Bean
GroovyScriptFactory foobar0（）{
新GroovyScriptFactory（file：/ C：/someDir/src/main/static/FoobarService.groovy）
}
}


看起来像是s与bean的定义在ApplicationContext的生命周期中的初始化方式/方式有关。我试过使用 @Order 和 @DependsOn 来控制bean排序 - 无济于事。值得一提的是，我现在正在重复以下日志 - 看起来像 ScriptFactoryPostProcessor 不断用bean的null定义覆盖bean（为什么？）。

2015-08-27 12：04：11.312信息5780 --- [main] osbfsDefaultListableBeanFactory：
重写bean'scriptFactory.foobar0'的bean定义：替换[Generic bean：class [null];
scope =;抽象= FALSE; lazyInit = FALSE; autowireMode = 0; dependencyCheck = 0; autowireCandidate = TRUE; p
rimary = false; factoryBeanName = NULL; factoryMethodName = NULL; initMethodName = NULL; destroyMethodName = n
ull]与[Generic bean：class [null];范围=;抽象= FALSE; lazyInit = FALSE; autowireMode = 0;依赖
dencyCheck = 0; autowireCandidate = TRUE;初级= FALSE; factoryBeanName = NULL; factoryMethodName = NULL; i
nitMethodName = null;


相关：

• SPR-10253 - 刷新注释的Groovy控制器导致ClassCastException


• SPR-10689
2.5及更高版本中的>>标记对于可刷新的Spring MVC端点不起作用

• SPR-12300 - 在@Configuration类中添加动态语言可刷新bean支持

解决方案

更简单的选择：

• 将FooBarService放在类路径中并使用@Component对其进行注释





$ b $ li

• 在mybeans.xml中使用lang命名空间 / li>
  

-

 < lang ：常规id =foobarService
 script-source =file：src / main / static / FoobarService.groovy/> 
  

Application.groovy

  @SpringBootApplication 
 @ImportResource（classpath：mybeans.xml）
 public class Application {
 public static void main（String []] args）{
 SpringApplication.run（Application，args）
} 
} 
  

I'd like to use Dynamic Languages Support of Spring Framework, to create a reloadable bean (at runtime!) from a Groovy script. I want to avoid xml configuration, and use annotations (or similar) within a Spring Boot Application context.

This is an extension to a question that's already been asked, the extension being that I DO want to get my hands dirty with BeanPostProcessors, Handlers, Parsers, whatever it takes.

I've had a quick look at the javadoc for ScriptFactoryPostProcessor, and have come up with working examples. I want to know why Application.groovy (v2) doesn't work?

---

beans.xml - works! (but I want to define the beans in Application.groovy instead of xml...)

<bean class="org.springframework.scripting.support.ScriptFactoryPostProcessor">
    <property name="defaultRefreshCheckDelay" value="1000" />
</bean>

<bean id="foobar0" class="org.springframework.scripting.groovy.GroovyScriptFactory">
    <constructor-arg value="file:/C:/someDir/src/main/static/FoobarService.groovy"/>
</bean>

---

Application.groovy (v1) - works! (but is a very ugly workaround)

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication app = new SpringApplication(Application)
        // Add GroovyScriptFactory after Application is prepared...
        app.addListeners(new ApplicationListener<ApplicationPreparedEvent>() {
            void onApplicationEvent(ApplicationPreparedEvent event) {
                def registry = (BeanDefinitionRegistry) event.applicationContext.autowireCapableBeanFactory
                def bd = BeanDefinitionBuilder.genericBeanDefinition(GroovyScriptFactory)
                        .addConstructorArgValue("file:/C:/someDir/src/main/static/FoobarService.groovy")
                        .getBeanDefinition()
                bd.setAttribute(ScriptFactoryPostProcessor.REFRESH_CHECK_DELAY_ATTRIBUTE, 1000)
                registry.registerBeanDefinition('foobar0', bd)
            }
        })
        app.run(args)
    }
    @Bean
    ScriptFactoryPostProcessor scriptFactory() {
        new ScriptFactoryPostProcessor()
    }
}

---

Application.groovy (v2) - doesn't work - why not?

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application, args)
    }
    @Bean
    ScriptFactoryPostProcessor scriptFactory() {
        new ScriptFactoryPostProcessor()
    }
    @Bean
    GroovyScriptFactory foobar0() {
        new GroovyScriptFactory("file:/C:/someDir/src/main/static/FoobarService.groovy")
    }
}

It looks like it's something to do with how/when the beans definitions are initialised in the the lifecycle of an ApplicationContext. I've tried using @Order and @DependsOn to control bean ordering - to no avail. Worth mentioning, I'm now getting the following log repeated - which looks like the ScriptFactoryPostProcessor is continually overwriting the bean with a "null" bean definition (why?).

2015-08-27 12:04:11.312  INFO 5780 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     :
Overriding bean definition for bean 'scriptFactory.foobar0': replacing [Generic bean: class [null];
scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; p
rimary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=n
ull] with [Generic bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=0; depen
dencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; i
nitMethodName=null; destroyMethodName=null]

Related:

• SPR-10253 - Refreshing annotated Groovy controllers cause ClassCastException
• SPR-10689 - tag in version 2.5 and higher doesn't work for refreshable Spring MVC endpoints
• SPR-12300 - Add support for dynamic languages refreshable beans in @Configuration classes

解决方案

Simpler alternatives:

• put FooBarService on the classpath and annotate it with @Component

or

• use the lang namespace in mybeans.xml

-

<lang:groovy id="foobarService"
    script-source="file:src/main/static/FoobarService.groovy" />

Application.groovy

@SpringBootApplication
@ImportResource("classpath:mybeans.xml")
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application, args)
    }
}

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